Cold hardiness & minimum temperature

Is Easter Egg Radish (Raphanus sativus 'Easter Egg')cold hardy? Hardiness zone & min temp

Also called Easter Egg radish, colourful mixed radish.

More about easter egg radish

About Easter Egg Radish

Raphanus sativus 'Easter Egg' · also called Easter Egg radish, colourful mixed radish · edible

Easter Egg is a blend of round radishes in red, pink, purple, and white skins, all with crisp white flesh, maturing fast in about 25-30 days. This cool-season annual wants full sun, loose moist soil, and quick uninterrupted growth. The mixed colours and staggered maturity make it a popular, decorative quick crop for beginners.

Cold limit: USDA Cool-season crop for USDA zones 2-11; sow in spring and autumn, as summer heat causes bolting and pithy roots · RHS H4 (hardy; sow successionally from early spring through autumn in the UK) (10-21°C)

What easter egg radish's hardiness rating actually means

Hardiness works differently for easter egg radish: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". Its RHS rating of H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA Cool-season crop for USDA zones 2-11; sow in spring and autumn, as summer heat causes bolting and pithy roots — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

Concretely, for easter egg radish as it gets too cold:

Light frost (around 0 to −2 °C) damages or kills tender summer crops outright; cold-hardy types take a few degrees of frost.
The plant does not "survive winter" — its life cycle simply ends, by design, when frost arrives or it finishes cropping.
A surprise late spring frost can also kill young transplants set out too early, before the season even starts.

Can easter egg radish go outside or overwinter — and where?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost.
In short-season zones, start it indoors or under cover to stretch the effective growing window.
Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when easter egg radish can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Frost protection for borderline easter egg radish

Easter Egg Radish is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks.
Have row cover ready for an unexpected late spring or early autumn frost.
Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.

Easter Egg Radish hardiness — frequently asked questions

Is easter egg radish cold hardy?

Hardiness works differently for easter egg radish: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". A seasonal crop, not a perennial. Easter Egg Radish is grown as an annual in USDA Cool-season crop for USDA zones 2-11; sow in spring and autumn, as summer heat causes bolting and pithy roots; you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature easter egg radish can survive?

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

What hardiness zone is easter egg radish?

Easter Egg Radish is rated USDA Cool-season crop for USDA zones 2-11; sow in spring and autumn, as summer heat causes bolting and pithy roots and RHS H4 — Hardy in an average winter across much of the temperate world.

Can easter egg radish survive winter outside?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost. In short-season zones, start it indoors or under cover to stretch the effective growing window. Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

How do I protect easter egg radish from frost?

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks. Have row cover ready for an unexpected late spring or early autumn frost. Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.